bfin_adv7393fb.c

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/*
 * Frame buffer driver for ADV7393/2 video encoder
 *
 * Copyright 2006-2009 Analog Devices Inc.
 * Licensed under the GPL-2 or late.
 */

/*
 * TODO: Remove Globals
 * TODO: Code Cleanup
 */

#define pr_fmt(fmt) DRIVER_NAME ": " fmt

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <asm/blackfin.h>
#include <asm/irq.h>
#include <asm/dma.h>
#include <linux/uaccess.h>
#include <linux/gpio.h>
#include <asm/portmux.h>

#include <linux/dma-mapping.h>
#include <linux/proc_fs.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>

#include "bfin_adv7393fb.h"

static int mode = VMODE;
static int mem = VMEM;
static int nocursor = 1;

static const unsigned short ppi_pins[] = {
    P_PPI0_CLK, P_PPI0_FS1, P_PPI0_FS2,
    P_PPI0_D0, P_PPI0_D1, P_PPI0_D2, P_PPI0_D3,
    P_PPI0_D4, P_PPI0_D5, P_PPI0_D6, P_PPI0_D7,
    P_PPI0_D8, P_PPI0_D9, P_PPI0_D10, P_PPI0_D11,
    P_PPI0_D12, P_PPI0_D13, P_PPI0_D14, P_PPI0_D15,
    0
};

/*
 * card parameters
 */

static struct bfin_adv7393_fb_par {
    /* structure holding blackfin / adv7393 parameters when
       screen is blanked */
    struct {
        u8 Mode;    /* ntsc/pal/? */
    } vga_state;
    atomic_t ref_count;
} bfin_par;

/* --------------------------------------------------------------------- */

static struct fb_var_screeninfo bfin_adv7393_fb_defined = {
    .xres = 720,
    .yres = 480,
    .xres_virtual = 720,
    .yres_virtual = 480,
    .bits_per_pixel = 16,
    .activate = FB_ACTIVATE_TEST,
    .height = -1,
    .width = -1,
    .left_margin = 0,
    .right_margin = 0,
    .upper_margin = 0,
    .lower_margin = 0,
    .vmode = FB_VMODE_INTERLACED,
    .red = {11, 5, 0},
    .green = {5, 6, 0},
    .blue = {0, 5, 0},
    .transp = {0, 0, 0},
};

static struct fb_fix_screeninfo bfin_adv7393_fb_fix __devinitdata = {
    .id = "BFIN ADV7393",
    .smem_len = 720 * 480 * 2,
    .type = FB_TYPE_PACKED_PIXELS,
    .visual = FB_VISUAL_TRUECOLOR,
    .xpanstep = 0,
    .ypanstep = 0,
    .line_length = 720 * 2,
    .accel = FB_ACCEL_NONE
};

static struct fb_ops bfin_adv7393_fb_ops = {
    .owner = THIS_MODULE,
    .fb_open = bfin_adv7393_fb_open,
    .fb_release = bfin_adv7393_fb_release,
    .fb_check_var = bfin_adv7393_fb_check_var,
    .fb_pan_display = bfin_adv7393_fb_pan_display,
    .fb_blank = bfin_adv7393_fb_blank,
    .fb_fillrect = cfb_fillrect,
    .fb_copyarea = cfb_copyarea,
    .fb_imageblit = cfb_imageblit,
    .fb_cursor = bfin_adv7393_fb_cursor,
    .fb_setcolreg = bfin_adv7393_fb_setcolreg,
};

static int dma_desc_list(struct adv7393fb_device *fbdev, u16 arg)
{
    if (arg == BUILD) { /* Build */
        fbdev->vb1 = l1_data_sram_zalloc(sizeof(struct dmasg));
        if (fbdev->vb1 == NULL)
            goto error;

        fbdev->av1 = l1_data_sram_zalloc(sizeof(struct dmasg));
        if (fbdev->av1 == NULL)
            goto error;

        fbdev->vb2 = l1_data_sram_zalloc(sizeof(struct dmasg));
        if (fbdev->vb2 == NULL)
            goto error;

        fbdev->av2 = l1_data_sram_zalloc(sizeof(struct dmasg));
        if (fbdev->av2 == NULL)
            goto error;

        /* Build linked DMA descriptor list */
        fbdev->vb1->next_desc_addr = fbdev->av1;
        fbdev->av1->next_desc_addr = fbdev->vb2;
        fbdev->vb2->next_desc_addr = fbdev->av2;
        fbdev->av2->next_desc_addr = fbdev->vb1;

        /* Save list head */
        fbdev->descriptor_list_head = fbdev->av2;

        /* Vertical Blanking Field 1 */
        fbdev->vb1->start_addr = VB_DUMMY_MEMORY_SOURCE;
        fbdev->vb1->cfg = DMA_CFG_VAL;

        fbdev->vb1->x_count =
            fbdev->modes[mode].xres + fbdev->modes[mode].boeft_blank;

        fbdev->vb1->x_modify = 0;
        fbdev->vb1->y_count = fbdev->modes[mode].vb1_lines;
        fbdev->vb1->y_modify = 0;

        /* Active Video Field 1 */

        fbdev->av1->start_addr = (unsigned long)fbdev->fb_mem;
        fbdev->av1->cfg = DMA_CFG_VAL;
        fbdev->av1->x_count =
            fbdev->modes[mode].xres + fbdev->modes[mode].boeft_blank;
        fbdev->av1->x_modify = fbdev->modes[mode].bpp / 8;
        fbdev->av1->y_count = fbdev->modes[mode].a_lines;
        fbdev->av1->y_modify =
            (fbdev->modes[mode].xres - fbdev->modes[mode].boeft_blank +
             1) * (fbdev->modes[mode].bpp / 8);

        /* Vertical Blanking Field 2 */

        fbdev->vb2->start_addr = VB_DUMMY_MEMORY_SOURCE;
        fbdev->vb2->cfg = DMA_CFG_VAL;
        fbdev->vb2->x_count =
            fbdev->modes[mode].xres + fbdev->modes[mode].boeft_blank;

        fbdev->vb2->x_modify = 0;
        fbdev->vb2->y_count = fbdev->modes[mode].vb2_lines;
        fbdev->vb2->y_modify = 0;

        /* Active Video Field 2 */

        fbdev->av2->start_addr =
            (unsigned long)fbdev->fb_mem + fbdev->line_len;

        fbdev->av2->cfg = DMA_CFG_VAL;

        fbdev->av2->x_count =
            fbdev->modes[mode].xres + fbdev->modes[mode].boeft_blank;

        fbdev->av2->x_modify = (fbdev->modes[mode].bpp / 8);
        fbdev->av2->y_count = fbdev->modes[mode].a_lines;

        fbdev->av2->y_modify =
            (fbdev->modes[mode].xres - fbdev->modes[mode].boeft_blank +
             1) * (fbdev->modes[mode].bpp / 8);

        return 1;
    }

error:
    l1_data_sram_free(fbdev->vb1);
    l1_data_sram_free(fbdev->av1);
    l1_data_sram_free(fbdev->vb2);
    l1_data_sram_free(fbdev->av2);

    return 0;
}

static int bfin_config_dma(struct adv7393fb_device *fbdev)
{
    BUG_ON(!(fbdev->fb_mem));

    set_dma_x_count(CH_PPI, fbdev->descriptor_list_head->x_count);
    set_dma_x_modify(CH_PPI, fbdev->descriptor_list_head->x_modify);
    set_dma_y_count(CH_PPI, fbdev->descriptor_list_head->y_count);
    set_dma_y_modify(CH_PPI, fbdev->descriptor_list_head->y_modify);
    set_dma_start_addr(CH_PPI, fbdev->descriptor_list_head->start_addr);
    set_dma_next_desc_addr(CH_PPI,
                   fbdev->descriptor_list_head->next_desc_addr);
    set_dma_config(CH_PPI, fbdev->descriptor_list_head->cfg);

    return 1;
}

static void bfin_disable_dma(void)
{
    bfin_write_DMA0_CONFIG(bfin_read_DMA0_CONFIG() & ~DMAEN);
}

static void bfin_config_ppi(struct adv7393fb_device *fbdev)
{
    if (ANOMALY_05000183) {
        bfin_write_TIMER2_CONFIG(WDTH_CAP);
        bfin_write_TIMER_ENABLE(TIMEN2);
    }

    bfin_write_PPI_CONTROL(0x381E);
    bfin_write_PPI_FRAME(fbdev->modes[mode].tot_lines);
    bfin_write_PPI_COUNT(fbdev->modes[mode].xres +
                 fbdev->modes[mode].boeft_blank - 1);
    bfin_write_PPI_DELAY(fbdev->modes[mode].aoeft_blank - 1);
}

static void bfin_enable_ppi(void)
{
    bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() | PORT_EN);
}

static void bfin_disable_ppi(void)
{
    bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() & ~PORT_EN);
}

static inline int adv7393_write(struct i2c_client *client, u8 reg, u8 value)
{
    return i2c_smbus_write_byte_data(client, reg, value);
}

static inline int adv7393_read(struct i2c_client *client, u8 reg)
{
    return i2c_smbus_read_byte_data(client, reg);
}

static int
adv7393_write_block(struct i2c_client *client,
            const u8 *data, unsigned int len)
{
    int ret = -1;
    u8 reg;

    while (len >= 2) {
        reg = *data++;
        ret = adv7393_write(client, reg, *data++);
        if (ret < 0)
            break;
        len -= 2;
    }

    return ret;
}

static int adv7393_mode(struct i2c_client *client, u16 mode)
{
    switch (mode) {
    case POWER_ON:      /* ADV7393 Sleep mode OFF */
        adv7393_write(client, 0x00, 0x1E);
        break;
    case POWER_DOWN:    /* ADV7393 Sleep mode ON */
        adv7393_write(client, 0x00, 0x1F);
        break;
    case BLANK_OFF:     /* Pixel Data Valid */
        adv7393_write(client, 0x82, 0xCB);
        break;
    case BLANK_ON:      /* Pixel Data Invalid */
        adv7393_write(client, 0x82, 0x8B);
        break;
    default:
        return -EINVAL;
        break;
    }
    return 0;
}

static irqreturn_t ppi_irq_error(int irq, void *dev_id)
{

    struct adv7393fb_device *fbdev = (struct adv7393fb_device *)dev_id;

    u16 status = bfin_read_PPI_STATUS();

    pr_debug("%s: PPI Status = 0x%X\n", __func__, status);

    if (status) {
        bfin_disable_dma(); /* TODO: Check Sequence */
        bfin_disable_ppi();
        bfin_clear_PPI_STATUS();
        bfin_config_dma(fbdev);
        bfin_enable_ppi();
    }

    return IRQ_HANDLED;

}

static int proc_output(char *buf)
{
    char *p = buf;

    p += sprintf(p,
        "Usage:\n"
        "echo 0x[REG][Value] > adv7393\n"
        "example: echo 0x1234 >adv7393\n"
        "writes 0x34 into Register 0x12\n");

    return p - buf;
}

static int
adv7393_read_proc(char *page, char **start, off_t off,
          int count, int *eof, void *data)
{
    int len;

    len = proc_output(page);
    if (len <= off + count)
        *eof = 1;
    *start = page + off;
    len -= off;
    if (len > count)
        len = count;
    if (len < 0)
        len = 0;
    return len;
}

static int
adv7393_write_proc(struct file *file, const char __user * buffer,
           size_t count, void *data)
{
    struct adv7393fb_device *fbdev = data;
    unsigned int val;
    int ret;

    ret = kstrtouint_from_user(buffer, count, 0, &val);
    if (ret)
        return -EFAULT;

    adv7393_write(fbdev->client, val >> 8, val & 0xff);

    return count;
}

static int __devinit bfin_adv7393_fb_probe(struct i2c_client *client,
                       const struct i2c_device_id *id)
{
    int ret = 0;
    struct proc_dir_entry *entry;
    int num_modes = ARRAY_SIZE(known_modes);

    struct adv7393fb_device *fbdev = NULL;

    if (mem > 2) {
        dev_err(&client->dev, "mem out of allowed range [1;2]\n");
        return -EINVAL;
    }

    if (mode > num_modes) {
        dev_err(&client->dev, "mode %d: not supported", mode);
        return -EFAULT;
    }

    fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
    if (!fbdev) {
        dev_err(&client->dev, "failed to allocate device private record");
        return -ENOMEM;
    }

    i2c_set_clientdata(client, fbdev);

    fbdev->modes = known_modes;
    fbdev->client = client;

    fbdev->fb_len =
        mem * fbdev->modes[mode].xres * fbdev->modes[mode].xres *
        (fbdev->modes[mode].bpp / 8);

    fbdev->line_len =
        fbdev->modes[mode].xres * (fbdev->modes[mode].bpp / 8);

    /* Workaround "PPI Does Not Start Properly In Specific Mode" */
    if (ANOMALY_05000400) {
        ret = gpio_request_one(P_IDENT(P_PPI0_FS3), GPIOF_OUT_INIT_LOW,
                    "PPI0_FS3")
        if (ret) {
            dev_err(&client->dev, "PPI0_FS3 GPIO request failed\n");
            ret = -EBUSY;
            goto free_fbdev;
        }
    }

    if (peripheral_request_list(ppi_pins, DRIVER_NAME)) {
        dev_err(&client->dev, "requesting PPI peripheral failed\n");
        ret = -EFAULT;
        goto free_gpio;
    }

    fbdev->fb_mem =
        dma_alloc_coherent(NULL, fbdev->fb_len, &fbdev->dma_handle,
                   GFP_KERNEL);

    if (NULL == fbdev->fb_mem) {
        dev_err(&client->dev, "couldn't allocate dma buffer (%d bytes)\n",
               (u32) fbdev->fb_len);
        ret = -ENOMEM;
        goto free_ppi_pins;
    }

    fbdev->info.screen_base = (void *)fbdev->fb_mem;
    bfin_adv7393_fb_fix.smem_start = (int)fbdev->fb_mem;

    bfin_adv7393_fb_fix.smem_len = fbdev->fb_len;
    bfin_adv7393_fb_fix.line_length = fbdev->line_len;

    if (mem > 1)
        bfin_adv7393_fb_fix.ypanstep = 1;

    bfin_adv7393_fb_defined.red.length = 5;
    bfin_adv7393_fb_defined.green.length = 6;
    bfin_adv7393_fb_defined.blue.length = 5;

    bfin_adv7393_fb_defined.xres = fbdev->modes[mode].xres;
    bfin_adv7393_fb_defined.yres = fbdev->modes[mode].yres;
    bfin_adv7393_fb_defined.xres_virtual = fbdev->modes[mode].xres;
    bfin_adv7393_fb_defined.yres_virtual = mem * fbdev->modes[mode].yres;
    bfin_adv7393_fb_defined.bits_per_pixel = fbdev->modes[mode].bpp;

    fbdev->info.fbops = &bfin_adv7393_fb_ops;
    fbdev->info.var = bfin_adv7393_fb_defined;
    fbdev->info.fix = bfin_adv7393_fb_fix;
    fbdev->info.par = &bfin_par;
    fbdev->info.flags = FBINFO_DEFAULT;

    fbdev->info.pseudo_palette = kzalloc(sizeof(u32) * 16, GFP_KERNEL);
    if (!fbdev->info.pseudo_palette) {
        dev_err(&client->dev, "failed to allocate pseudo_palette\n");
        ret = -ENOMEM;
        goto free_fb_mem;
    }

    if (fb_alloc_cmap(&fbdev->info.cmap, BFIN_LCD_NBR_PALETTE_ENTRIES, 0) < 0) {
        dev_err(&client->dev, "failed to allocate colormap (%d entries)\n",
               BFIN_LCD_NBR_PALETTE_ENTRIES);
        ret = -EFAULT;
        goto free_palette;
    }

    if (request_dma(CH_PPI, "BF5xx_PPI_DMA") < 0) {
        dev_err(&client->dev, "unable to request PPI DMA\n");
        ret = -EFAULT;
        goto free_cmap;
    }

    if (request_irq(IRQ_PPI_ERROR, ppi_irq_error, 0,
            "PPI ERROR", fbdev) < 0) {
        dev_err(&client->dev, "unable to request PPI ERROR IRQ\n");
        ret = -EFAULT;
        goto free_ch_ppi;
    }

    fbdev->open = 0;

    ret = adv7393_write_block(client, fbdev->modes[mode].adv7393_i2c_initd,
                fbdev->modes[mode].adv7393_i2c_initd_len);

    if (ret) {
        dev_err(&client->dev, "i2c attach: init error\n");
        goto free_irq_ppi;
    }


    if (register_framebuffer(&fbdev->info) < 0) {
        dev_err(&client->dev, "unable to register framebuffer\n");
        ret = -EFAULT;
        goto free_irq_ppi;
    }

    dev_info(&client->dev, "fb%d: %s frame buffer device\n",
           fbdev->info.node, fbdev->info.fix.id);
    dev_info(&client->dev, "fb memory address : 0x%p\n", fbdev->fb_mem);

    entry = create_proc_entry("driver/adv7393", 0, NULL);
    if (!entry) {
        dev_err(&client->dev, "unable to create /proc entry\n");
        ret = -EFAULT;
        goto free_fb;
    }

    entry->read_proc = adv7393_read_proc;
    entry->write_proc = adv7393_write_proc;
    entry->data = fbdev;

    return 0;

free_fb:
    unregister_framebuffer(&fbdev->info);
free_irq_ppi:
    free_irq(IRQ_PPI_ERROR, fbdev);
free_ch_ppi:
    free_dma(CH_PPI);
free_cmap:
    fb_dealloc_cmap(&fbdev->info.cmap);
free_palette:
    kfree(fbdev->info.pseudo_palette);
free_fb_mem:
    dma_free_coherent(NULL, fbdev->fb_len, fbdev->fb_mem,
              fbdev->dma_handle);
free_ppi_pins:
    peripheral_free_list(ppi_pins);
free_gpio:
    if (ANOMALY_05000400)
        gpio_free(P_IDENT(P_PPI0_FS3));
free_fbdev:
    kfree(fbdev);

    return ret;
}

static int bfin_adv7393_fb_open(struct fb_info *info, int user)
{
    struct adv7393fb_device *fbdev = to_adv7393fb_device(info);

    fbdev->info.screen_base = (void *)fbdev->fb_mem;
    if (!fbdev->info.screen_base) {
        dev_err(&fbdev->client->dev, "unable to map device\n");
        return -ENOMEM;
    }

    fbdev->open = 1;
    dma_desc_list(fbdev, BUILD);
    adv7393_mode(fbdev->client, BLANK_OFF);
    bfin_config_ppi(fbdev);
    bfin_config_dma(fbdev);
    bfin_enable_ppi();

    return 0;
}

static int bfin_adv7393_fb_release(struct fb_info *info, int user)
{
    struct adv7393fb_device *fbdev = to_adv7393fb_device(info);

    adv7393_mode(fbdev->client, BLANK_ON);
    bfin_disable_dma();
    bfin_disable_ppi();
    dma_desc_list(fbdev, DESTRUCT);
    fbdev->open = 0;
    return 0;
}

static int
bfin_adv7393_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{

    switch (var->bits_per_pixel) {
    case 16:/* DIRECTCOLOUR, 64k */
        var->red.offset = info->var.red.offset;
        var->green.offset = info->var.green.offset;
        var->blue.offset = info->var.blue.offset;
        var->red.length = info->var.red.length;
        var->green.length = info->var.green.length;
        var->blue.length = info->var.blue.length;
        var->transp.offset = 0;
        var->transp.length = 0;
        var->transp.msb_right = 0;
        var->red.msb_right = 0;
        var->green.msb_right = 0;
        var->blue.msb_right = 0;
        break;
    default:
        pr_debug("%s: depth not supported: %u BPP\n", __func__,
             var->bits_per_pixel);
        return -EINVAL;
    }

    if (info->var.xres != var->xres ||
        info->var.yres != var->yres ||
        info->var.xres_virtual != var->xres_virtual ||
        info->var.yres_virtual != var->yres_virtual) {
        pr_debug("%s: Resolution not supported: X%u x Y%u\n",
             __func__, var->xres, var->yres);
        return -EINVAL;
    }

    /*
     *  Memory limit
     */

    if ((info->fix.line_length * var->yres_virtual) > info->fix.smem_len) {
        pr_debug("%s: Memory Limit requested yres_virtual = %u\n",
             __func__, var->yres_virtual);
        return -ENOMEM;
    }

    return 0;
}

static int
bfin_adv7393_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
{
    int dy;
    u32 dmaaddr;
    struct adv7393fb_device *fbdev = to_adv7393fb_device(info);

    if (!var || !info)
        return -EINVAL;

    if (var->xoffset - info->var.xoffset) {
        /* No support for X panning for now! */
        return -EINVAL;
    }
    dy = var->yoffset - info->var.yoffset;

    if (dy) {
        pr_debug("%s: Panning screen of %d lines\n", __func__, dy);

        dmaaddr = fbdev->av1->start_addr;
        dmaaddr += (info->fix.line_length * dy);
        /* TODO: Wait for current frame to finished */

        fbdev->av1->start_addr = (unsigned long)dmaaddr;
        fbdev->av2->start_addr = (unsigned long)dmaaddr + fbdev->line_len;
    }

    return 0;

}

/* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
static int bfin_adv7393_fb_blank(int blank, struct fb_info *info)
{
    struct adv7393fb_device *fbdev = to_adv7393fb_device(info);

    switch (blank) {

    case VESA_NO_BLANKING:
        /* Turn on panel */
        adv7393_mode(fbdev->client, BLANK_OFF);
        break;

    case VESA_VSYNC_SUSPEND:
    case VESA_HSYNC_SUSPEND:
    case VESA_POWERDOWN:
        /* Turn off panel */
        adv7393_mode(fbdev->client, BLANK_ON);
        break;

    default:
        return -EINVAL;
        break;
    }
    return 0;
}

int bfin_adv7393_fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
{
    if (nocursor)
        return 0;
    else
        return -EINVAL; /* just to force soft_cursor() call */
}

static int bfin_adv7393_fb_setcolreg(u_int regno, u_int red, u_int green,
                     u_int blue, u_int transp,
                     struct fb_info *info)
{
    if (regno >= BFIN_LCD_NBR_PALETTE_ENTRIES)
        return -EINVAL;

    if (info->var.grayscale)
        /* grayscale = 0.30*R + 0.59*G + 0.11*B */
        red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;

    if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
        u32 value;
        /* Place color in the pseudopalette */
        if (regno > 16)
            return -EINVAL;

        red   >>= (16 - info->var.red.length);
        green >>= (16 - info->var.green.length);
        blue  >>= (16 - info->var.blue.length);

        value = (red   << info->var.red.offset) |
            (green << info->var.green.offset)|
            (blue  << info->var.blue.offset);
        value &= 0xFFFF;

        ((u32 *) (info->pseudo_palette))[regno] = value;
    }

    return 0;
}

static int __devexit bfin_adv7393_fb_remove(struct i2c_client *client)
{
    struct adv7393fb_device *fbdev = i2c_get_clientdata(client);

    adv7393_mode(client, POWER_DOWN);

    if (fbdev->fb_mem)
        dma_free_coherent(NULL, fbdev->fb_len, fbdev->fb_mem, fbdev->dma_handle);
    free_dma(CH_PPI);
    free_irq(IRQ_PPI_ERROR, fbdev);
    unregister_framebuffer(&fbdev->info);
    remove_proc_entry("driver/adv7393", NULL);
    fb_dealloc_cmap(&fbdev->info.cmap);
    kfree(fbdev->info.pseudo_palette);

    if (ANOMALY_05000400)
        gpio_free(P_IDENT(P_PPI0_FS3)); /* FS3 */
    peripheral_free_list(ppi_pins);
    kfree(fbdev);

    return 0;
}

#ifdef CONFIG_PM
static int bfin_adv7393_fb_suspend(struct device *dev)
{
    struct adv7393fb_device *fbdev = dev_get_drvdata(dev);

    if (fbdev->open) {
        bfin_disable_dma();
        bfin_disable_ppi();
        dma_desc_list(fbdev, DESTRUCT);
    }
    adv7393_mode(fbdev->client, POWER_DOWN);

    return 0;
}

static int bfin_adv7393_fb_resume(struct device *dev)
{
    struct adv7393fb_device *fbdev = dev_get_drvdata(dev);

    adv7393_mode(fbdev->client, POWER_ON);

    if (fbdev->open) {
        dma_desc_list(fbdev, BUILD);
        bfin_config_ppi(fbdev);
        bfin_config_dma(fbdev);
        bfin_enable_ppi();
    }

    return 0;
}

static const struct dev_pm_ops bfin_adv7393_dev_pm_ops = {
    .suspend = bfin_adv7393_fb_suspend,
    .resume  = bfin_adv7393_fb_resume,
};
#endif

static const struct i2c_device_id bfin_adv7393_id[] = {
    {DRIVER_NAME, 0},
    {}
};

MODULE_DEVICE_TABLE(i2c, bfin_adv7393_id);

static struct i2c_driver bfin_adv7393_fb_driver = {
    .driver = {
        .name = DRIVER_NAME,
#ifdef CONFIG_PM
        .pm   = &bfin_adv7393_dev_pm_ops,
#endif
    },
    .probe = bfin_adv7393_fb_probe,
    .remove = __devexit_p(bfin_adv7393_fb_remove),
    .id_table = bfin_adv7393_id,
};

static int __init bfin_adv7393_fb_driver_init(void)
{
#if  defined(CONFIG_I2C_BLACKFIN_TWI) || defined(CONFIG_I2C_BLACKFIN_TWI_MODULE)
    request_module("i2c-bfin-twi");
#else
    request_module("i2c-gpio");
#endif

    return i2c_add_driver(&bfin_adv7393_fb_driver);
}
module_init(bfin_adv7393_fb_driver_init);

static void __exit bfin_adv7393_fb_driver_cleanup(void)
{
    i2c_del_driver(&bfin_adv7393_fb_driver);
}
module_exit(bfin_adv7393_fb_driver_cleanup);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michael Hennerich <[email protected]>");
MODULE_DESCRIPTION("Frame buffer driver for ADV7393/2 Video Encoder");

module_param(mode, int, 0);
MODULE_PARM_DESC(mode,
    "Video Mode (0=NTSC,1=PAL,2=NTSC 640x480,3=PAL 640x480,4=NTSC YCbCr input,5=PAL YCbCr input)");

module_param(mem, int, 0);
MODULE_PARM_DESC(mem,
    "Size of frame buffer memory 1=Single 2=Double Size (allows y-panning / frame stacking)");

module_param(nocursor, int, 0644);
MODULE_PARM_DESC(nocursor, "cursor enable/disable");